Huawei Ascend Mate7 MT7-L09 - Manual (Page 30)

Calls and contacts
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Drag right to answer the call.
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Drag left to reject the call.
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Drag up to reject the call and send the caller a message.
On the dialer screen, touch > Call settings > Reject calls with SMS to
edit the message that will be sent.
What you can do during a call
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